A method and a machine for continuously manufacturing shopper bags with flexible handles of non-weldable and non-glueable material, in particular a pair of textile cord handles comprising preparing flexible handles already fitted with metal crossbar terminals, covering the handle retaining terminals by means of a folded over lining flap, carrying out in sequence preparatory operations on sheet panels, pre-cut to size and pre-creased, and forming the bag over special parallelepiped forms mounted on a rotating table.